From fa433836c643bbd9a60ed8ccdc9451a1edd98418 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Fri, 28 Oct 2022 02:06:01 +0100
Subject: handling of unix domain sockets

---
 Makefile |  2 +-
 unix.c   | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 unix.h   | 17 +++++++++++++++++
 3 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 unix.c
 create mode 100644 unix.h

diff --git a/Makefile b/Makefile
index 2269f1c..9d57e9e 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ CC=cc
 debug=-g -DDEBUG -DLOCAL
 CFLAGS=$(MORE_CFLAGS) -Wall
 
-OBJS=bee.o irc.o util.o
+OBJS=bee.o irc.o util.o unix.o
 
 all: apiobot
 apiobot: $(OBJS)
diff --git a/unix.c b/unix.c
new file mode 100644
index 0000000..bbb663d
--- /dev/null
+++ b/unix.c
@@ -0,0 +1,64 @@
+#include "unix.h"
+
+#include "conf.h"
+
+static int
+sock_perms(int fd)
+{
+	// first get group by name
+	struct group *group;
+	if ((group = getgrnam(SOCKETGROUP)) == NULL) {
+		fprintf(stderr,"no such group: %s\n",SOCKETGROUP);
+		return -1;
+	}
+	// set group on socket
+	if (fchown(fd, -1, group.gr_gid) == -1) {
+		perror("chown");
+		return -1;
+	}
+
+	// get current permissions, so we can modify them.
+	struct stat sb;
+	if (fstat(fd, &sb) == -1) {
+		perror("stat");
+		return -1;
+	}
+	if (fchmod(fd, sb.st_mode|S_IWGRP) == -1) {
+		perror("chmod");
+		return -1;
+	}
+
+	return 0;
+}
+
+// takes filename, returns socket fd
+// or -1 or whatever
+int
+unix_setup(char sockname[])
+{
+	unlink(sockname);
+
+	int sock = socket(AF_UNIX, SOCK_DGRAM, 0);
+	if (sock == -1) {
+		perror("(unix) socket");
+		return -1;
+	}
+
+	struct sockaddr_un name;
+	memset(&name, 0, sizeof name);
+	name.sun_family = AF_UNIX;
+	strncpy(name.sun_path, SOCKETNAME, (sizeof name.sun_path)-1);
+	if (bind(sock, (struct sockaddr *)&name, sizeof name) == -1) {
+		perror("(unix) bind");
+		return -1;
+	}
+
+	if (sock_perms(sock) == -1) {
+		fprintf(stderr,"warning: couldn't correctly set up permissions on %s\n",sockname);
+	}
+
+	return sock;
+}
+
+	
+
diff --git a/unix.h b/unix.h
new file mode 100644
index 0000000..410911e
--- /dev/null
+++ b/unix.h
@@ -0,0 +1,17 @@
+#ifndef unix_h_INCLUDED
+#define unix_h_INCLUDED
+
+#include <sys/types.h>
+#include <grp.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+
+// takes filename, returns socket fd
+// or -1 on failure.
+int unix_setup(char sockname[]);
+
+#endif // unix_h_INCLUDED
+
-- 
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